Micrometer.



.l. CSIGAS,

MICROMETER.

APPLICATION FILED .IIIG.I3,.I9I3.

2 SHEETS-SHEET l.

Patented July 17, 1917 INyENTon WITNESSES JT ya@ i. CSIGAS.

MICROMETER. A'PLlcAmn msn AUG. 1s. wxs; x l ,283,556D Patented July 17, 1917.

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MICROMETER.

Application filed August 13, 1913.

To all 'whom t may concern:

Be it known that l, JoitN Cs1GAs,a subject of the King of Hungary, residing at Springfield, in the county of Hampden and State of Massachusetts, have invented certain new and useful Improvements in Mi-y crometers, of which the following is a specification, reference being had therein to the accompanying drawing.

-This invention relates to inicrometers,

and has for its object to4 provide a device of such class, in a manner as hereinafter set forth, with a pair of arms capable of being conveniently adjusted to a desired distance Jt'or measuring work and further capable of being conveniently locked when adjusted to the desired position.

A further objectmf the invention is to provide a device of such class which is co1nparativcly simple in itsconstruction and arrangement, strong, durable, accurate in measurement, conveniently operated and inexpensive to iminufacture.

lV ith the foregoing \and other objects in view the invention'consists of the novelconstruction, combination and arrangement of parts, as hereinafter more specifically described and illustrated in the accompanying drawings, wherein an embodiment of the invention is shown, but it is to be understood that changes, variations and modifications can be resorted to which come within Athe scope of the claims hereunto appended.

In the drawings, wherein like refer# ence characters denote corresponding parts throughout the several views z- Figure 1 is a front elevation of a micrometer in accordance with this-invention,

Fig. 2 is a side elevation,

Fig. 3 is a verticalsectional view,

Fig. 4 is a top plan of a detail,

F ig. 5 is a sectional side elevation,

Fig. (3 is an elevation of a. detail illustratgraduation,

Fig. Tis a sectional detail of the inner `sections of the caliper arms,` and Figs. S, 9, 10, 1l, 12 and 13 are modified forms of outer sections of the' caliper arms.

.Referring to Ythe drawings `in detail 1 denotes an inverted Y,"sha].)ed relatively narrow casing havingthe inner faceof each 'side thereof provided with a pocket 2, in which is secured an inclined guide rail The rails 3 extend alt an inclination andin an opposite direction with respect to each other, the inclination being downwardly Specification of Letters Patent.

graduations 12. The housing21 at Patented July 17,1917. Serial No. 784,630.

and outwardly. The casing l"in proximity to its upper end is provided with anfopen.- ing 4 for a purpose to be presently referred to and formed integral with the upper end of the casing is an annular member 5 having the upper portion G'of its periphery beveled. The annular member 5 has its inner face threaded, as at 7 and said annular member 5 is closed at its top -by a disk 8 formed with a centrally disposed opening 9. Projecting upwardly from the disk 8 is an interiorly threaded cylindrical sleeve 10 having its upper end provided with a reduced tapering peripheral threaded eXtension 11 carrying a nut l2n for adjusting and taking up any wear. The extension 11 is split as clearly illustrated in Fig. 6 and said sleeve 10 has its periphery provided with two sets of graduations A12, 13, the former being disposed longitudinallyand the latter circumferentially of said sleeve 10.

Mounted in the sleeve 10 as well as projecting therefrom is :in-adjusting member consisting of a stem portion 14 with threads on the exterior surface with thc threads of the justing member further Y ing extension 15 which is integral with the stem portion 1l and extends through the disk 8 and into the casing 1. Formed integral with the stem portion 14 at the top thereof is a conical 'shaped head 16 having connected thereto a screw 17 carrying a ratchet 18. Connected to the ratchet 18 by the hold fast device 19 is a cap further includes a cylindrical housing' 21 which incloses the sleeve 10 and which has its lower end beveled, as at 22 and provided with a graduated scalel 23, the latter associating with thegraduations 13. rlhe edge of the beveled end 22 associates with the sleeve 10. The adis inset, as at 2l and further formed with a iange 25 which provides a shoulder 26. The inset portion 21 in connection with the fiange 25 forms what may be termed a conical pocket 2T for the reception of the head.

1G, which is-forced into this pocket by suflicicnt pressure to prevent its turning therein.

Mounted upon the shoulder 26 and surrounding the Hange 25 is a flanged disk 28 upon which is mounted the ratchet 18 and engaging with the disk 28, by a tongue and groove connection Q9 is a collar 30 to which is connected a spring 31 adapted Lo engage includes a depend.

vertically disposed piece 20. The adjusting membery its top and which engages the ratchet 18 for clicking purposes when the caliper arms, which will be hereinafter referred to, have engaged the work. 'When the inset portion of the housing 21 is rotatedpy -the workman the stem 14 is of couisei'aised or lowered. At the same time the-caliper arins are closed or opened depending upon the direction of movement of the stem 1i. In order to make 'the tension or pressure of the arms on the wplyalways the same the operator whilelro `a ing the housing 21 grasps the collar 30 'to .which the spring 31 is secured. The other end of the spring will then snap from, one tooth.

to the next after the caliper arms engage the work, thus limiting the pressureof the arms on the work. It is to be understood that the ratchet disk 18 is turned by the stem 11 since the screw 17 is connected to the disk and turns with the head 16y and housing 21. This screw alsoservesthe purpose of drawing the concshaped head 16 tightly into the part 2awith suiiicient pressure to cause the head 16-tol move with the housing 21 and the head 16 in turn operates the friction disk 18 I The manner of'setting up the head 16 with respect to the housing 2 1 is such that when the housing 21 or collar 30 is revolved, a like movement 'will be imparted to the screw 17, under such circumstances elevating or lowering the stem 15 relative to the sleeve 10 depending upon which direction -the housing 21 orcollar 30 is turned, and, at the' same time rotating the stem 14 and -raising Qi' lowering the same to cause -the arms 32 tb be opened more or less.

The reference .characters 39; and 33 denote the inner sections of a. pair of caliper or measuring arms, and said sections are pivotally connected together, as at 34 and are constantlyfored apart Ithrough the medium of the spring 35. .The section 33 is provided with an extension 36 carrying a swivel joint 37 with which the extension 15 is connected for connecting .said joint 37 to the lower^- end of the extension 15, whereby when the adjusting member 14 is rotated sections 3Q and 33 will be carried therewith up or down vwithin the casing 1. The stem 15 is retained "in place by means of pins 37 Each of the sections 32, 33 has its lower end formed with a socket 39, into which is adapted to extend the shank 40 of the opter section of the ,caliper or measuring arm. The shank 40 is 'held in position by a set screw 41.

, In Figs. 1, Q, 3 and 5 the outer section of each caliper or measuring arm is indicated by the reference character 4Q, while in Figs. 8 to'13 inclusive, the said outer sections are indicated by thereference characters 43 to L18 both inclusive.4 l

The section `32 as well as the section 33, is provided in proximity to its respective socket 39, with an eye 49, to which is pivoty caliper.

ally connected, by a pin 50 a guide block 51, which slides upon the rail 3, as clearly illustrated in Fig. 3.

Permanently engaging with the threads 7 of the member 5, is a peripherally, threaded clamping member 53 having its lower end provided with a Harige 54. The member 53 supports a split tapering locking collar 55, which is adapted, when the clamping member 53 is screwed hoine, to grip the extension 15 and securely lock the adjusting member from movement. -The opening 4 provides for convenient access to the flange 54 to .enable the .turning of the member 53 torelease or clamp the co lar The disk 8 arrests the upward movement of the collar 55, while the lower edge 56 of the member 5 arrests upward movement of the clamping member 53.

The outerlsections 43 of the lcaliper or measuriner caliper, the outer sections 44 as a divider, the outer sections 45 and46 as an outside caliper, theY outer sections47 as a paper gage, and the outer sections 48 as a key-hole Vhen the adjusting member'is shifted in one rdirection theadjusting member Mund hthe extension 15 are moved downwardly,

moving the caliper-armstoward each other against the action of thespring 35 and when theadjusting member is moved in the opposite direction, the member 14 and extension 15 vare moved upwardly, and' thespring 35 separates the caliper arms. When the desired adjustment is had, which can be ascertained by the graduations, the adjusting member is locked by the clamping member 53 and locking collar 55.

Vhat I claim is l.

v1. A measuring instrumentcomprising a teasing, a pair of normally extended arms arranged therein and engaged thereby, an adjusting member for shifting said arms to de.

vcrease or increase the space. between said arms, and a clamping' member for "locking said arms from movement.A l

2. A measuring instrument comprising'a casing having a threaded extension provided with sets of graduations', a pair of spring arms are employed as an inside controlled normally separated arms ar.

ranged within and engaged by said casing, an adjusting member connected with said arms and engaging said extension for moving the arms to` increase or decrease the' space between said arms, and being provided with graduations associating with the graduations upon-the extension.

3. A measuring instrument comprising a lcasing having. a threaded extension provided with sets of graduations, a pair of spring controlled normally separated arms arranged within and engaged by sald casing, an adJusting Vmember connected with saidarms and engaging said extension for moving the arms to increase or decrease the space between said arms, and being provided with graduations associating with the graduations upon the extension, and a clamping member in said casing and engaging with A said adjusting member for locking the said i through that is threaded` a threaded stem passing through the threaded opening of the barrel portion, said stem being pivotally connected to a pair of measuring caliper arms, said arms being normally retained in separated position against the inner surface of the inclosing casing. means for rotating the threaded stem for causing the same to move in one or two lopposite directions through the casing for varying the opening of the caliper arms, and means including a cup-shaped member for lockiiig the stem to the casing as described. y

5. A measuring instrument comprising an inclosing easing the lower portion of which is substantially inverted Y shaped, pivotally connected calipering arms located in said end portion, a spring for normally holding the arms extended and in contact with the inner surface of the easing, means for operatingl the arms comprising a housing connected with the arms by means of a stem, tension means for making the pressure of the arms the same on the work that is being measured` and means for locking the stem comprising a clamping member having a conical recess therein and having threaded connection with the casing7 a locking collar having a conical portion located in the re- .cess of the sleeve and having an opening therethrough to receive said stem which is attached to the n'ieasuring arms, the casing having openings to permit accessI to the locking means, as described.

(3. In a measuring instrument,.the combination with an inclosing casing one end of which is formed" with inclined sides the opposite end of which is formed with a barrel portion having a threaded opening therethrough, a threaded stem engaging the opening the lower end of which stein is pivotally connected to a pair of measuring arms. a spring for normally separating the arms and forcingthe same into engagement with the inclined surfaces of the casing, means for rotating the stem for vreciproc-ating the a rms in the casing, whereby 4the extent ot' the opening of the arms may be varied and means for locking the stein when the arms have been moved into the desired position of adjust-nient.

In testimony whereof I affix my signature in the presence of two witnesses.

JOHN CSIGAS.

Vitnesses :l

STEM-IEN `S. TAr'r, SIMPSON. CLARK. 

